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Articles on Trending Technologies
Technical articles with clear explanations and examples
Zombie and Orphan Processes in Linux
Every program runs as a process in Linux operating system. When a process ends or gets disconnected from its parent, special types of processes can be created. These processes are known as zombie and orphan processes. Details about the zombie and orphan processes are given as follows: Zombie Processes A zombie process is a process whose execution is completed but it still has an entry in the process table. Zombie processes usually occur for child processes, as the parent process still needs to read its child's exit status. Once this is done using the wait system call, the zombie process ...
Read MoreWhen will be an IllegalStateException (unchecked) thrown in Java?
In this article, we will learn how an IllegalStateException (unchecked) is thrown in Java. IllegalStateException is a subclass of RuntimeException. It occurs when a method is used at the wrong time or when an object is not in the right state. What is an IllegalStateException? An IllegalStateException is an unchecked exception in Java. This exception may arise in our Java program mostly if we are dealing with the collection framework of java.util.package. There are many collections, such as List, Queue, Tree, and Map, of which List and Queues (Queue and Deque) throw this IllegalStateException under particular conditions. When will ...
Read MoreHow to initialize memory with a new operator in C++?
In C++, the new operator is mainly used for allocating memory on the heap, but to initialize that memory, you need to explicitly declare and provide a value to it.Here, the new operator dynamically allocates memory for a variable or object during runtime and returns a pointer to the allocated memory. Here are the following ways you can initialize memory using the new operator: For built-in types For arrays For objects new Operator in Built-in Types The built-in types are the basic data types in C++, which ...
Read MoreC++ Program to Implement List in STL
A List in C++ STL library is hardcoded implementation of a doubly linked list data structure. In this article, we will learn how to implement and use a list in C++ . What is List? List is a doubly linked container provided in the C++ STL library, in which each element points to both its previous and next elements. Meaning, in this list we can quickly traverse in both forward and backward direction using pointers just like a doubly linked list. Compared to vectors or arrays, these lists allow fast insertions and deletions from the middle of the sequence. ...
Read MoreC++ Program to Implement Deque in STL
Deque or Double Ended Queue is a special type of queue where we can insert and delete elements from both front and back. In this article, we will learn how to use deque from C++ STL (Standard Template Library). What is Deque? Deque is a linear data structure in which the insertion and deletion operations can be performed at both the ends (front and rear). Meaning, the data can be inserted at both front and rear positions and can be deleted from both front and rear positions. This gives more flexibility compared to a normal queue which supports only ...
Read MoreConvert List of Characters to String in Java
In this article, we will learn to convert a list of characters to strings in Java. Sometimes, when we handle character-based data structures, we need to convert a list of characters into a string. Problem Statement Given a list of characters, the task is to convert it into a single string where the order of characters remains unchanged. Input: list = Arrays.asList('W', 'e', 'l', 'c', 'o', 'm', 'e'); Output: Welcome Methods to Convert a List of Characters to a String The following are the different approaches to convert a list of characters to a string in Java - ...
Read MoreC++ Program to Implement Wheel Sieve to Generate Prime Numbers Between Given Range
The wheel Sieve method is used to find the prime numbers within a given range. Wheel factorization is a graphical method for manually performing a preliminary to the Sieve of Eratosthenes that separates prime numbers from composites. In this method, prime numbers in the innermost circle have their multiples in similar positions as themselves in the other circles, forming spokes of primes and their multiples. Multiple of these prime numbers in the innermost circle form spokes of composite numbers in the outer circles. In this article, we have set the limit to 100. Our task is to implement the ...
Read MoreC++ Program to Implement Sieve of Atkin to Generate Prime Numbers Between Given Range
The Sieve of Atkin is a modern algorithm for finding all prime numbers up to a specified integer. It follows three simple steps to find the prime numbers. It uses three quadratic expressions that remove the composite numbers. After this, we remove the multiples of squares of already existing prime numbers and at the end, we return the prime numbers. In this article, we have set the limit to '30'. Our task is to implement the Sieve of Atkin method to generate all the prime numbers up to the limit in C++. Here is an example of prime numbers up ...
Read MoreC++ Program to Implement Sieve of eratosthenes to Generate Prime Numbers Between Given Range
The Sieve of Eratosthenes algorithm is one of the most efficient ways to find prime numbers smaller than n when n is smaller than around 10 million. It follows a simple process of marking the multiples of already prime numbers as false i.e. non-prime numbers. In this article, we have a given number as 'num'. Our task is to find all the prime numbers less than or equal to num using the Sieve of Eratosthenes algorithm in C++. Example Here is an example to find prime numbers less than 10: Input: num = 10 Output: 2 3 5 7 ...
Read MoreWhat is the difference between cerr and clog streams in c++?
cerr and clog are both objects of the stderr(standard error) stream, which is used to display error messages or diagnostics. In this article, we will learn the difference between these two in more detail. Further, the description of the cout object is also given to get a clearer picture. Unbuffered standard error stream (cerr) The cerr is the standard error stream, which is used to output the errors. This is also an instance of the ostream (as iostream means input/output stream) class. As cerr is unbuffered, therefore it's used when we need to display the error message instantly. It doesn't ...
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